Windshield wiper



March 1l,` 1958 J. G. PONT EVAL 2,825,920

wINnsHIELD wIPER l v Filed sept. 2o, 1954 s sheets-snm 1 INVENTORS March 1l, 1958 J. G. PONT ErAL 2,825,920

" WINDSHIELD WIPER Filed sept.l 2o, 1954 v s sheets-sheet z March 11, 1958 J. G, PONT ETAL 2,825,920 l 4 WINDSHIELD WIPER Filed sept. 2o, 1954 3 sheets-sheet 3 y INVENTORS. se/ )7a/12',"

States Pater-Itza `2,825,920 Patented Mar. 11, 1958 gsephgG. kunnen@ CharlsJaDitGioia; Detrpit;..Mih.,

` 19,;ChryslerfCqrporation,gfliighlandnrnrk,J

famtafiaaatfpelaware enamora@amaainaanoo ns 1of severe curvature tha und the forward cornersl of the vehicle body an ,1"` t shieldswof this ,type cannot have ysuieientareas l-sthelzeoiz tisfafitorilyV wipedr by the conventional l.wip A he to'fore` generally used on `automobil/esf4 -principal object of ourlinvention-immondea gmechanismhthat in .addition to moving the-*wiping .Y e,vin.an`,.arcuate path provides controlled movement fih-cluding pivotal movement .of the-bladelrelative wiper uarrn and Yfurther provides means to elongate etrac'tthe wiper arm .during each oscillationltherepf to aryfthe effective radius ofthe .wiper arm.v

,Otinwiping mechanism is particularly adapted fortus ywid;"winolshields of vthe type which valthoughtthey have furvatures 1in horizontal sections thereofihaveysuh- 40 stan ally "str aightt'line contour :in t verticallsegtions iofifthe yWl to therm which has been referred `to hereiniscontrolled in'faneltfort to keep the wiper blade substantially parallel feld.'n he pivotal movement of the'blade relative with the straight line sections of `the windshield inl/the 45 ar tas of severe curvature of the windshield.

"Itis a further object of the invention tolincreasetthe wiped areaby slightly elongating the effective ,radius of the,` wiper arm during a portion of the wiping stroktof theflwiper blade. It is desirable to providegnechaHiSIl 50 foraccomplishing this for the Aupperedge ,ofthe wind shield is a limiting factor on the length of wiper armaand er blade that can be moved over the windshieldl with,- ou't interference with rthe upper edge thereof whilealong wipery stroke to reach as far as possible toward `the-outer anclvupperextremities of the windshield.

In the` drawings:

Fig. 1 is a front elevational View of a portion of an automobile equipped with our novel windshield wiper;.

Fig2 is a horizontal section taken on the lineari-:3 0f Fial;

Fig. .3 is a fragmentary elevational view showing -ou-r windshield wiper at the position corresponding to the outer edge of its wiper pattern with the wiper arm-n its elongated condition;

Fig. 4 is a fragmentary front elevational v view similar to Fig. 3 and showing the windshield wiper inv an interef ctive wiper arm is desirable at the `outer limits of` the 55 mitten .wa-t s memmm nm wm um. im annum: weer www?! .La an. u MPR/ tra f Eiga oasoctiondoksooostaalineef oftFigft aand ig aeration `han:sono,hoalitlo 't'-f-l'ffoffiar54l l iniziata!!i v Das?! anoautamoolle whnh -le-lllostratedffin l desa wiriclshieltl1,0twhichdsl curvedtasgillus- F1952 and, itnwillt xbefntttelathattr the windshield MemLely .wide vrand has, epd plortiogusA 1112. of@ severe remthratv "Wrap, argonnhthetforwardE corners of:y the Cl body.` wiadallioldapf thiS-atypofaroourrontlyfboatlassian somehow.Qr, yeh-inlets.; Thoaaotomoblorbody 10 A,Lintwhinlt the` wiadshioleh 10;,ist@anointedy includes at roof 12, and o,.ow1.lfiandncanyentionaltWoathorstrippios; 16

t is ptovidodtaw Il@ y y Mthe1:eripl1eiy .ofpthetwindshield. 1It .istcontemplated,tthatanair offwodlshiold .wiping-devices 115i bonsai' intoonlbinatifonawith windshioldtltt 1o respecwjpe eft and- 'ghtnptortionsatheroof although .our

' rein willpeof one@suolgdevice18.`

@projects outwardly ,.oft `the` con/L14, as .l ansifisiownalledcowl Supported Y i. i. ont! inagonoral :use on .automobiles an `itnis tobepnderstopd hat,thishaftlisldrivenfby suitlinlgage ctgrrlg'etin'gr,v towasourco opower. such as :fn tor or anileqtri motorsalliasis4general1y hulztsectioo bygmeoo olivia iolta The, wiperrarm 'hub' SaotiQo-Zi oai@ the wirst Sectionlzoooporoto-fo defmevafrstn o1 1exte` ev porationof.thewiper arm. `The wiperarrnwalkso includes anonter -section 30 which is "telesncopica'lhly'received over the wiperparrn section 2.6 and is adapted fqrjongitudinal sliding t. movement relativo t0, Wiaor arm rsetionlll ,totottocttelongation and tro.- traotion. of. 'the t wiper, arm. ,tous varyho afectivo t length thereof.

AtspriogiZ-'has .one.e11.fd..socurodto `thel wiper armisec- Ltion 22.andthe other end sellld tothe pin `28 .to urge the wiper arm sections towards the retracted position. p In addition, A the sprngj32 `urgeswthe wiper tarn-:,sections land Y30 cloclwisealgout pin1 28l, to^press the wiper arm and Consequently thawiperfblade carried oothoondthorof inwardly toward the winlsllield.y

The wiper arm section 30 carries a cam gollowertelel mem .34 Whihlistrotatably moontodoo pini-i6 projecting outwardly from Awiper.argoSection 30.. The rcowl .Supported mom., r, 2151's Provided -on its. periphery with com surta@ "B "whih is.; adapted to cooperate with .tho oomirfollowor clement 34 tootgofwipor armtseotion 30, to "extootwtolatyo t wiper ann -Soctism 4(26.1 tot @from @elongation of ,that .nor arm .A wiper ,blade 4.0. i y,..pivotally- Imouated near/the V.outer extremity of wiper armtsoction `310 Hby .means ,of `a :pin 42 `which is Vrotatably ,mounted in .the wiper arm; section 3.0,` Themwiperblade40rmay` be .of any commercial type which ispadapteflyto QX ,l0 `faccommodatet slight var ttorrstn windshieldurvatu-re ;and,onesuitab le type of blade ,is shown in lArnzleijson Patent12,596,063. The means by which wiper 40 is carried on pin 42mav'y be any oneogseveraldetahable clip -onnectons which are entuse .on motor"vehillesf` For example, Anden- Son `Potent 2,432,693 .illustratoaooofform ofouoha icona nec'tion.: For simplicity the,wiper blade hasbeenillus-V tratedi as` ofI extremely `sirnple construction althoughyit is to be pnderstoodrthat the nexible type of ;bladefreferred mediate position with the wiper arm in its retracted con- 70 to above. is tpreferred Forl practical .,purposesl-randfconvenience z-,inzterminology-A vthe -pin 42 `and wiperltbladeeltl may be considered to be one assembly which will be referred to herein by the term wiper blade.

A laterally extending finger 44 is illustrated as carried by pin 42 although it is to be understood that the finger could be provided on the Wiper blade 40 itself. As mentioned above, however, for convenience of terminology the linger 44 may be said to extend laterally from the wiper blade which includes the wiper blade proper 40 and the pin 42. The finger 44 serves as a lever to induce pivotal movement of wiper blade 40 about the axis of pin 42 when finger 44 is moved longitudinally relative to the wiper arm 22. In order to irnpart longitudinal movement to linger 44 a rod 50 is provided. The rod 50 has one end thereof connected to nger 44 in laterally spaced relationship to the pin 42 and the rod extends toward the drive shaft 20. The rod 50 is preferably hidden throughout a portion of its length by passing inside of the wiper arm 22. The lower extremity of the rod 50 is illustrated as secured to the drive shaft although it is to be understood that it could be connected to any oscillating but non extensible portion of the windshield wiper mechanism, such as the hub portion 24 of the wiper arm or the wiper arm section 26. Connection of the lower end of rod 50 to either the hub portion 24 or wiper arm section 26 amounts to an operative connection of the rod 50 to the drive shaft 20 since the hub portion 24 and wiper arm section 26 kare themselves operatively connected to drive shaft 20.

The rod is of fixed determinate length while the wiper arm 22 as described above is extensible and extension of the wiper arm 22 thus moves pin 42 radially relative to drive shaft 20 and the rod 50 limits corresponding movement of finger 44 so that the net result is a pivotal movement of the wiper blade about the axis of pin 42 whenever a variation in length of the wiper arm 22 is imparted by the cam element 34 or the spring 32.

It will thus be seen that means have been provided to accommodate an extension of the wiper arm 22 when the wiper blade is in the outermost portion of its wiper pattern adjacent a wrap around portion 11 of the windshield 10. Simultaneously the elongation of the wiper arm causes the wiper blade to pivot relative to the wiper arm to more nearly maintain the blade in a vertical plane. This is beneficial because the windshield 10 has substantially straight sections in vertical directions and the more nearly that the Wiper blade 40 stays to a vertical position at the `outermost region of the wiping pattern where the windshield curvature is severe the more uniform will be the contact of the blade with the glass throughout the length of the wiper blade.

We claim:

l. A device for wiping a curved windshield of a vehicle comprising a drive shaft journalled on a portion of the vehicle in the vicinity of a windshield margin, said shaft being adapted to be oscillated, an arm carried by said shaft for oscillation therewith, -a wiper blade carried by said arm and mounted for pivotal movement relative thereto, said arm intermediate said blade and said shaft being provided with relatively extensible sections adapted to accommodate elongation and retraction of said arm, means including a cam surface and cam follower responsive to oscillation of said shaft to effect elongation and retraction of said arm, and means extending between said blade and said shaft to pivot said blade relative to said arm as an incident to elongation and retraction of said arm.

2. A device for wiping a curved windshield mounted tion relative to said first arm element, a cam follower carried by said second arm section and adapted to follow said cam surface to extend said second arm section relative to said first arm element, spring means urging said second arm section ytoward a retracted position and thereby maintaining said cam follower element on said cam surface, a wiper blade pivotally mounted on the outer end of said second arm section, and connecting means operatively connecting said blade and one of said elements and operable to pivot said blade relative to said second arm section as an incident to extension of the latter.

3. A device for wiping a curved windshield of a vehicle comprising a drive shaft journalled on a portion of the vehicle in the vicinity of a windshield margin, said shaft being adapted to be oscillated, an arm carried by said shaft for oscillation therewith, a wiper blade carried by said arm and mounted for pivotal movement relative thereto, said arm intermediate said blade and said shaft being provided with relatively extensible sections adapted to accommodate elongation and retraction of said arm, means including a cam surface carried by a stationary portion of said vehicle, a cooperating cam follower carried by one of said sections and a return spring operatively connecting said sections, said means being responsive to oscillation of said shaft to effect elongation and retraction of said arm, and means extending between `said blade and said shaft to pivot said blade relative to said arm as an incident to elongation and retraction of said arm.

4. A device for wiping a curved windshield of a vehicle comprising a drive shaft journalled on a portion of the vehicle in the vicinity of a windshield margin, said shaft being adapted to be oscillated, an arm carried by said shaft for oscillation therewith, a wiper blade carried by said arm and mounted for pivotal movement about an axis which extends in a direction substantially normal to said glass, said arm intermediate said blade and said shaft being provided with relatively extensible sections adapted to accommodate elongation and retraction of said arm, means including a cam surface and cam follower responsive to oscillation of said shaft to effect elongation and retraction of said arm, a lever extending laterally from said axis adapted to induce pivotal movement of said blade about said axis in response to movement of said lever longitudinally of said arm, and means operatively connected to said lever and to said shaft to oscillate with said shaft and move said lever longitudinally relative to said arm as an incident to elongation and retraction of said arm.

5. A device for wiping a curved windshield of a vehicle comprising a drive shaft element journalled on a portion of the vehicle in the vicinity of a windshield margin, said shaft element being adapted to be oscillated, a wiper arm carried by said shaft for oscillation therewith and including a wiper arm element carried by said shaft element and extending laterally therefrom, a second wiper arm portion mounted on said wiper arm element for movement lengthwise of said arm relative to said wiper arm element, a cam carried by said second wiper arm portion, a cam surface carried by said vehicle in the vicinity of said drive shaft element, said cam being adapted to follow said cam surface during oscillation of said arm and said cam surface being adapted to rnove said cam and said second wiper arm portion outwardly to effect elongation of said wiper arrn during oscillation of said wiper arm, a wiper blade pivotally mounted on said second wiper arm portion, and means providing a connection between said blade and one of said elements to effect a pivotal movement of said blade relative to said wiper arm as an incident to elongation of said wiper arm.

6. A device `for wiping a curved windshield of a vehicle comprising a drive shaft journailed on a portion of the lvehicle in the vicinity of a windshield margin, said shaft being adapted to be oscillated through repeated cycles including rotation in a rst direction and return, an arm mechanism carried by said shaft for oscillation therewith, a wiper blade carried by said arm mechanism and mounted for pivotal movement relative thereto, said arm mechanism intermediate said blade and said shaft comprising a plurality of cooperating elements mounted for movement relative to each other to alter the effective radius of the arm mechanism, means operative to effect relative movement of said elements as an incident to each cycle of oscillation of said arm mechanism, said means including cooperating elements respectively carried by a stationary portion of said vehicle and by said arm mechanism, and means operatively connected to said blade and to said shaft to pivot said blade relative to said arm as an incident to relative movement of said arm elements.

7. A device for wiping a curved windshield of a vehicle comprising a drive shaft journalled on a portion of the vehicle in the vicinity of a windshield margin, said shaft being adapted to be oscillated through repeated cycles including rotation in a irst direction and return, an arm mechanism carried by said shaft for oscillation therewith, a wiper blade carried by said arm mechanism and mounted for pivotal movement relative thereto, said arm mechanism intermediate said blade and said shaft being provided with relatively extensible sections adapted to accommodate elongation and retraction of said arm, one of said sections supporting said wiper blade and another of said sections being mounted on said shaft, means operative to effect relative extension and retraction of said sections as an incident to each cycle of oscillation of said arm mechanism, said means including cooperating elements respectively carried by a stationary portion of said vehicle and by said arm mechanism, and means operatively connected to said blade and to said oscillating assembly to pivot said blade relative to said arm as an incident to elongation and retraction of said arm.

8. A device for wiping a curved windshield of a vehivle comprising a drive shaft journalled on a portion of the vehicle in the vicinity of a windshield margin, said shaft being adapted to be oscillated, an arm carried by said shaft for oscillation therewith, a wiper blade carried by said arm and mounted for pivotal movement relative thereto, said arm intermediate said blade and said shaft being provided with relatively extensible sections adapted to accommodate elongation and retraction of said arm, one of said sections supporting said wiper blade and another of said sections being mounted on said shaft, means including a cam surface carried by a stationary portion of said vehicle and a cooperating cam follower carried by one of said sections to effect elongation and retraction of said arm in response to oscillation of said shaft, and means operatively connected to said blade and to said oscillating assembly to pivot said blade relative to said arm as an incident to elongation and retraction of said arm.

References Cited in the le of this patent UNITED STATES PATENTS 2,079,399 Drew et al. May 4, 1937 2,158,254 Rosenberg May 16, 1939 2,185,572 Sawyer Jan. 2, 1940 2,412,319 Carey Dec. 10, 1946 

